The decision extends beyond the USA, with Google employees continuing to work from home in all of company's other locations, including the UK, Brazil, and India.
The change was made to help employees plan ahead and applies worldwide, Chief Executive Officer Sundar Pichai wrote in an email sent to employees on Monday.
Most Google employees will have the option to not return to work from the company's more than 100 offices around the world until at least next summer as the COVID-19 pandemic rages in the US and other countries.
Google had originally planned to allow a significant number of employees to begin returning to its Mountain View, California headquarters and other offices in June or July, but the company pushed back the reopening until January. It marks a six-month extension of Google's previous plan to keep most of its offices closed through the rest of this year.
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But new guidelines mean Google's biggest offices will remain largely unoccupied through June 2021.
Google has about 200,000 full-time and contract employees, and nearly all of them will be covered by the remote work extension.
"With robust health and safety protocols in place, we have opened offices in 42 different countries and hope to reopen in many more as conditions permit", Pichai said.
The company stated earlier that most of its employees would work from home for the rest of 2020.